EP3220789B1 - Mixer mit temperatursensor - Google Patents

Mixer mit temperatursensor Download PDF

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Publication number
EP3220789B1
EP3220789B1 EP16781723.8A EP16781723A EP3220789B1 EP 3220789 B1 EP3220789 B1 EP 3220789B1 EP 16781723 A EP16781723 A EP 16781723A EP 3220789 B1 EP3220789 B1 EP 3220789B1
Authority
EP
European Patent Office
Prior art keywords
blender
heating plate
cap
jar
thermistor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16781723.8A
Other languages
English (en)
French (fr)
Other versions
EP3220789A1 (de
Inventor
Bengt Ivar Anders Ivarsson
Maarten Cornelis Jacob DE HOOG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips NV
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Publication date
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Publication of EP3220789A1 publication Critical patent/EP3220789A1/de
Application granted granted Critical
Publication of EP3220789B1 publication Critical patent/EP3220789B1/de
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
    • A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
    • A47J43/046—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven with tools driven from the bottom side
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
    • A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
    • A47J43/07—Parts or details, e.g. mixing tools, whipping tools
    • A47J43/0716—Parts or details, e.g. mixing tools, whipping tools for machines with tools driven from the lower side
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A47J27/004—Cooking-vessels with integral electrical heating means
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00—Parts, details or accessories of cooking-vessels
    • A47J36/24—Warming devices
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00—Parts, details or accessories of cooking-vessels
    • A47J36/24—Warming devices
    • A47J36/2483—Warming devices with electrical heating means
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
    • A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
    • A47J43/07—Parts or details, e.g. mixing tools, whipping tools
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
    • A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
    • A47J43/07—Parts or details, e.g. mixing tools, whipping tools
    • A47J43/0716—Parts or details, e.g. mixing tools, whipping tools for machines with tools driven from the lower side
    • A47J43/0722—Mixing, whipping or cutting tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/211—Measuring of the operational parameters
    • B01F35/2115—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/213—Measuring of the properties of the mixtures, e.g. temperature, density or colour
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
    • B01F35/2215—Temperature
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
    • A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
    • A47J43/07—Parts or details, e.g. mixing tools, whipping tools
    • A47J43/08—Driving mechanisms
    • A47J43/085—Driving mechanisms for machines with tools driven from the lower side
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F2035/99—Heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/808—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers driven from the bottom of the receptacle

Definitions

  • the invention relates to a blender for blending ingredients.
  • the invention may be used in the field of food blending, in particular kitchen appliance blenders.
  • Blenders are kitchen appliances designed for mixing or blending food ingredients such as fruits, milk and ice, into liquids.
  • Blenders typically consist of a base, having a vertically positioned powerful a/c motor with a first coupling, and a cylindrical jar located directly above the base.
  • the jar has a rotatable blade assembly at the bottom with a second coupling driven by the first coupling.
  • Blenders comprising means for heating the ingredients in the jar are known.
  • a first version of this type of blenders comprises a jar made of metal, a heating element integrated in the jar and an electrical connection between the base and the jar for powering the heating element.
  • Another, less common version of this type of blenders includes a jar made of glass material and a heating element disposed in the base. The heating element heats a bottom part of the jar by heat conduction, and therefore no electrical connection is provided between the jar and the base.
  • This latter type of blenders has the advantage of providing a full transparency of the jar and a sense of quality to the user, and also allows the jar to be machine-washable since the jar does not have any electrical connection.
  • a temperature sensor in the blender In order to achieve an effective cooking of the food ingredients, without undercooking, overcooking, overflowing or dry-boiling, it is useful to provide a temperature sensor in the blender to measure the temperature in the jar and provide a temperature feedback to the base.
  • One problem with measuring the temperature in the jar is that the temperature sensor cannot be directly in contact with the food ingredients.
  • One solution is to sense the temperature through the glass wall of the jar or on an extended lip coming out from a blade holding component of the jar. However, this solution gives a reading of the temperature in the jar that is delayed and therefore not accurate.
  • US2008/0264270 discloses a baby food maker comprising a jar having an open top and an open bottom for holding food.
  • a top cap is provided for closing the open top of the jar and a bottom cap sealingly engages with the lower end of said jar for forming a cooking chamber.
  • a blending means is installed inside the cooking chamber for blending food and a heating tube is fixedly installed on the bottom of the bottom cap for heating food.
  • US2015/0101491 discloses a soup maker comprising a container mounted to an annular seat receiving a heat conducting pan that receives food to be cut by a cutter.
  • a heating pan abuts a bottom of the thermally conducting pan and is connected to a heating tube which is electrically connected to a power supply terminal.
  • a temperature sensor abuts the heating pan.
  • the soup maker comprises a base including a coupling portion having a terminal hole and a sensor hole.
  • US2008/0035630 discloses a cooking device comprising a coupling housing having a detachable vessel with a detachable pulverising blade, a sensor and a plate type of a heater on which a plurality of heat bands are installed to adjust the calorific value.
  • a base is coupled to the lower part of the coupling housing.
  • the blender for blending ingredients according to the invention comprises:
  • the heating plate and the bottom part are in contact with each other, making heat conduction possible from the heating plate to the bottom part and therefore to the ingredients in the container.
  • the position of the temperature sensor through the heating plate is such that an accurate sensing of the temperature of the bottom part is enabled.
  • the blender therefore helps preventing undercooking, overcooking, overflowing or dry-boiling and allows for an effective cooking of the ingredients.
  • the temperature sensor is in contact with the bottom part. This further helps providing an accurate measurement of the temperature of the bottom part.
  • the heating plate comprises a heating element, the temperature sensor extending through the heating plate in an area where the heating element does not extend. This advantageously ensures that the heating element does not disrupt the measurement of the temperature of the bottom plate, whilst ensuring that the base part, in which the heating plate, the heating element and the temperature sensor are arranged, remains compact.
  • the heating element is arch-shaped and comprises a first electrical connection and a second electrical connection, the temperature sensor being arranged in-between the first electrical connection and the second electrical connection. This further advantageously ensures that the base remains compact.
  • the temperature sensor comprises a thermistor. This advantageously allows for a precise measurement of the temperature of the bottom part.
  • the temperature sensor comprises a cap encapsulating the thermistor.
  • the cap is made of a high temperature resistant material. The cap is therefore configured to withstand high temperatures and does not deteriorate when the heating plate is at a high temperature.
  • the cap is cylindrical-shaped. This advantageously ensures the cap fits the shape of the temperature sensor and also fits through the heating plate.
  • the cap has a diameter in the range [5 mm; 20 mm].
  • the heating plate comprises an aperture for receiving the cap.
  • the heating plate and the cap are dimensioned to create an air gap in-between.
  • the air-gap advantageously helps ensuring that heat conduction from the heating element directly towards the temperature sensor is limited.
  • the air-gap advantageously helps ensuring that the heat coming from the bottom part towards the temperature sensor is predominant over the heat coming from the heating element, and that the temperature sensor is therefore responsive to the heat coming from the bottom part rather than to the heat coming from the heating element. This allows the temperature sensor to properly detect the temperature in the container without being disrupted by the heat coming from the heating element.
  • an insulating member is provided in the air-gap. This advantageously further helps limiting heat conduction from the heating element directly to the temperature sensor.
  • the cap is movable along a vertical direction relative to the heating plate, the cap comprising a flat top part, the cap being adapted to take a first position when the bottom part does not contact with the heating plate, and a second position when the bottom part contacts with the heating plate, the flat top part coming out by a given distance from an external surface of the heating plate in the first position, the flat top part being aligned with the external surface in the second position.
  • the given distance is in the range [1 mm; 10 mm].
  • the cap is biased toward the first position. This advantageously further ensures that the capped temperature sensor is in contact with the bottom part when the container is placed on the base part.
  • the thermistor is in contact with the flat top part. This advantageously improves the accuracy of the temperature sensing.
  • the thermistor is a Negative Temperature Coefficient thermistor.
  • a blender 10 for blending food ingredients in accordance with the invention is shown.
  • the blender 10 described herein is for example a programmable cooking blender.
  • the blender 10 comprises:
  • the heating assembly 12 has a heating plate 22 for transferring heat by conduction to the detachable bottom part 14.
  • the base part 11 comprises a temperature sensor 23 for sensing the temperature of the bottom part 14 of the container 13, the temperature sensor 23 extending through the heating plate 22.
  • the container 13, or jar assembly 13, is configured to be secured to the base part 11.
  • the jar assembly 13 comprises a jar 24 and a collar assembly 25 or skirt 25.
  • the jar 24 is generally cylindrical.
  • the jar 24 has a sidewall 26 and comprises an upper region 27 and lower region 28, or lower neck 28.
  • the diameter of the lower region 28 is less that the diameter of the upper region 27.
  • the upper region 27 comprises an upper opening 29 through which food ingredients to be blended, for example ingredients for a soup, can be introduced in the jar 24.
  • the lower region 28 comprises a lower opening 30 that is closed by the detachable bottom part 14.
  • the lower region 28 has a lower end 31 including ajar sealing surface 32.
  • a spout 33 is arranged at an end of the sidewall 26 in the upper region 27.
  • a lid 34 along with a lid seal 35 are provided for sealingly closing the upper opening 29.
  • a measuring cup 36 may be provided in a recess 36a in the lid 34.
  • a handle 37 may be attached to the sidewall 26 of the jar 24.
  • the jar 24 is advantageously made of transparent glass so that the user can see the ingredients in the jar 24 during use.
  • an internal retaining rib 38 may extend circumferentially from the sidewall 26 in the lower region 28, towards the centre of the jar 24.
  • a plurality of internal retaining ribs (not shown) extend along the circumference of the sidewall 26 in the lower region 28 towards the centre of the jar 24.
  • a plurality of external locating ribs 39 for example four external locating ribs 39, may be distributed around the circumference of the jar 24.
  • the external locating ribs 39 project outwards from the sidewall 26.
  • the external locating ribs 39 may be secured to the collar assembly 25.
  • the collar assembly 25 is arranged around the lower region 28 and is configured to receive the bottom part 14.
  • the collar assembly 25 is secured to the lower region 28.
  • the collar assembly 25 comprises a first, inner collar 41 and a second, outer collar 40.
  • the inner collar 41 and the outer collar 40 are assembled together by means of a plurality of screws 42.
  • the outer collar 40 may surround the inner collar 41 such that the outer collar 40 and the inner collar 41 are concentric.
  • the external locating ribs 39 may be sandwiched or secured between the inner collar 41 and the outer collar 40 so that the collar assembly 25 is fixedly attached to the lower region 28.
  • the outer collar 40 may extend circumferentially around the lower region 28 and may extend downwards beyond the lower region 28.
  • the inner collar 41 may extend circumferentially around the lower region 28 and may extend downwards beyond the lower region 28.
  • the outer collar 40 may extend downwards beyond the inner collar 41 so that when the jar assembly 13 is placed on a surface such as a table, the jar assembly 13 rests on the outer collar 40.
  • the inner collar 41 comprises an inner thread 43.
  • the outer collar 40 and the inner collar 41 are advantageously made of plastic material.
  • a pad 44 may be disposed between the outer collar 40 and the sidewall 26 in the lower region 28.
  • the pad 44 extends circumferentially around the lower region 28 between the outer collar 40 and the sidewall 26.
  • the pad 44 is advantageously made of rubber. The pad 44 helps preventing damage of the outer collar 40 during lifetime of the blender 10.
  • the detachable bottom part 14 is illustrated in Fig.3 to Fig.5 .
  • the bottom part 14 is intended to close the lower opening 30 of the jar 24.
  • the bottom part 14 comprises the blade assembly 16, a blade holder 45, the grip element 21 allowing the user to detach the bottom part 14, and a sealing element 46 or sealing gasket 46 for sealing the lower opening 30 of the jar 24.
  • the first, upper end 17 of the blade assembly 16 extends in the jar 24 and comprises a plurality of blades 18.
  • the plurality of blades 18 are mounted on a shaft 47.
  • the second, lower end 19 of the blade assembly 16 faces the base part 11 and comprises a coupling assembly 48 including the coupling element 20.
  • the coupling element 20 is secured to the shaft 47 by means of a coupling nut 49 or coupling screw 49.
  • a plurality of O-rings 50, C-rings 51, washers 52 and bearing elements 53 with screws 54 are also provided in the coupling assembly 48 to ensure a good connection between the coupling element 20 and the blade assembly 16.
  • the coupling element 20 is preferably circular and has for example an outer diameter of approximately 29 millimetres.
  • the blade holder 45 is configured to position the blade assembly 16 relative to the jar 24.
  • the blade holder 45 is configured to maintain the shaft 47 substantially parallel to the sidewall 26 of the jar 24.
  • the blade holder 45 has a generally circular shape.
  • the blade holder 45 comprises the bottom plate 15 configured to contact with the heating plate 22 in the base part 11 when the jar assembly 13 is arranged on the base part 11.
  • the bottom plate 15 is generally flat.
  • the bottom plate 15 is generally circular.
  • the blade holder 45 comprises a central passage 55 through which the shaft 47 extends.
  • the central passage 55 is generally circular.
  • the blade holder 45 comprises a circumferential wall 56 projecting upwards.
  • the circumferential wall 56 may be substantially vertical.
  • the blade holder sealing surface 57 extends from an outer edge of the circumferential wall 56.
  • the blade holder sealing surface 57 is substantially perpendicular to the circumferential wall 56 and faces upwards.
  • the blade holder sealing surface 57 extends circumferentially around the wall 56.
  • the blade holder 45 is advantageously made of die-cast aluminium to effectively conduct heat from the heating plate 22 to the food ingredients inside the jar 24.
  • the flat bottom plate 15 is preferably machined by Computer Numerical Control (CNC) machining.
  • the blade holder 45 is coated with a thermoplastic material such as Teflon or any other coating allowing the blade holder 45 to be machine-washable.
  • the grip element 21 is attached to the blade holder 45.
  • the grip element 21 and the blade holder 45 are assembled by plurality of screws 58, for example four screws 58.
  • the grip element 21 has a plurality of protuberances 59, for example four protuberances 59, coinciding with holes (not shown) in the grip element 21 that receive the screws 58 for assembling the grip element 21 and the blade holder 45.
  • the protuberances 59 allow for an easy gripping of the grip element 21 by the user.
  • the grip element 21 is in the form of a grip ring 21 having an upper wall 60 and a lower wall 61.
  • the grip ring 21 forms a protecting sleeve around the blade holder 45.
  • the grip ring 21 forms a circular ribbon or perimeter wall around the flat bottom plate 15.
  • the lower wall 61 extends beyond the coupling element 20 so that the bottom plate 15 is protected and prevented from being scratched or deteriorated, which would be detrimental to the heat transfer from the heating plate 22.
  • the lower wall 61 of the grip ring 21 therefore improves the durability of the bottom part 14 and therefore the durability of the blender 10.
  • the upper wall 60 of the grip ring 21 extends upwards around the sealing gasket 46 such that the grip element 21 holds the sealing gasket 46 when the bottom part 14 is detached.
  • the grip ring 21 comprises at least one external nail-shaped element 59a or external finger grip 59a for allowing the user to firmly hold the grip element 21 when detaching the bottom part 14.
  • the grip element 21 comprises a plurality of external finger grips 59a formed by the protuberances 59 distributed on the lower wall 61.
  • the grip ring 21 is advantageously manually threaded to the inner collar 41.
  • an outer thread 62 is formed in the upper wall 60.
  • the outer thread 62 is adapted to cooperate with the inner thread 43 of the inner collar 41 to attach the bottom part 14 to the collar assembly 25.
  • the grip element 21 is made of plastic material.
  • both the inner collar 41 and the grip ring 21 are advantageously made of plastic material, both the inner collar 41 and the grip ring 21 have resiliency properties that ensure a good fit between the grip ring 21 and the inner collar 41. Therefore, an enhanced connection between the grip ring 21 and the inner collar 41 is enabled.
  • the simple connection between the grip ring 21 and the collar assembly 25 limits the number of parts needed by the user to assemble the jar assembly 13. This facilitates the use of the blender 10. As the bottom part 14 is easily detachable, the jar 24 and the blades 18 are also more easily cleanable.
  • the grip ring 21 is made of a high-temperature resistant material so that the grip ring 21 can withstand high temperatures and therefore does not deteriorate when the bottom plate 15 is heated.
  • the grip ring 21 is made of a thermal insulating material, so that the user does not burn themselves when detaching the bottom part 14 in case the jar assembly 13 has just been removed from the hot heating plate 22 and the temperature of the bottom plate 15 is still high. The grip ring 21 therefore helps avoiding the user to be burnt and helps improving the safety of the blender 10.
  • the sealing element 46 or sealing gasket 46 is arranged between the blade holder 45 and the jar 24.
  • One function of the sealing gasket 46 is to ensure the sealing between the detachable bottom part 14 and the jar 24 to prevent food ingredients and liquid in the jar 24 from leaking outside the jar 24.
  • the sealing gasket 46 comprises at least one friction rib 63 extending upwards inside the jar 24.
  • the friction rib(s) 63 aims to create turbulences among the food ingredients during blending, to improve the blending performance.
  • the friction rib(s) 63 replaces the ribs made of glass and moulded together with the jar 24 of known blenders.
  • the at least one friction rib 63 extends along an internal surface of the sidewall 26 in the lower region 28 of the jar 24.
  • the at least one friction rib 63 comprises a plurality of friction ribs 63 distributed around an inner periphery IP of the sealing gasket 46.
  • a number of four friction ribs 63 is chosen.
  • the friction ribs 63 are regularly distributed around the inner periphery IP. For example, if a number of four friction ribs 63 is chosen, the friction ribs 63 are distributed every 90 degrees around the inner periphery IP.
  • At least one of the friction ribs 63 comprises a tab portion 64 extending along a direction RD (represented in Fig.6 ) being radial compared to an inner periphery IP of the sealing gasket 46.
  • the direction RD directs toward the centre of the inner periphery IP.
  • the tab portion 64 is arranged at an upper part U (represented in Fig.7B ) of the at least one friction rib 63.
  • the tab portion 64 is at the most upper part of the friction rib 63.
  • the tab portion 64 t the form of a truncated pyramid.
  • the sealing gasket 46 comprises a ring element 65 having a first surface S1 facing the blade holder 45 and a second surface S2 facing the jar 24. At least one of the first surface S1 and the second surface S2 comprises concentric compression ribs CR1, CR2.
  • the compression ribs CR1 are on the first surface S1 and the compression ribs CR2 are on the second surface S2.
  • the compression ribs CR1, CR2 aim to further improving the contact with the lower region 28 of the jar 24.
  • the sealing gasket 46 and the at least one friction rib 63 form a single element made of moulded rubber material.
  • the at least one friction rib 63 is glued or attached as separate elements, and are for example made of plastic material.
  • the inner periphery IP is provided with a plurality of inner retention ribs 66 distributed circumferentially around the circumference of the sealing gasket 46.
  • an outer periphery OP of the sealing gasket 46 may be provided with a plurality of outer retention ribs 67 distributed circumferentially around the ring element 65.
  • the plurality of inner and outer retention ribs 66, 67 help improving the retention of the sealing gasket 46 between the circumferential wall 56 of the blade holder 45 and the upper wall 60 of the grip ring 21.
  • the sealing gasket 46 is supported by the blade holder 45.
  • the sealing gasket 46 is maintained tight between the upper wall 60 of the grip ring 21 and the circumferential wall 56 of the blade holder 45. In this way, the sealing gasket 46 does not fall down when the user detaches the bottom part 14.
  • the sealing gasket 46 is tightly held in place between the blade holder sealing surface 57 and the jar sealing surface 32, and also abuts against the internal retaining rib 38 of the jar 24. This helps ensuring a good sealing of the lower opening 30 of the jar 24.
  • the blender 10 therefore provides a reliable sealing between the detachable bottom part 14 and the jar assembly 13.
  • the inner collar 41 and the grip element 21 are both advantageously in plastic material, friction between the inner thread 43 and the outer thread 62 is reduced and an easy attachment/removal of the bottom part 14 is enabled.
  • the heat transfer occurs by heat conduction from the heating plate 22 in the base part 11 to the bottom plate 15 in the jar assembly 13, the jar assembly 13 does not need any electrical connection. This increases safety for the user and allows the jar assembly 13 to be machine-washable.
  • the base part 11 may comprise a display screen 68 and a control button 69 enabling the user to make a selection among a plurality of cooking programs.
  • the base part 11 comprises the heating assembly 12 for heating the ingredients in the jar 24, and a gearing system 70 configured to couple with the coupling element 20 to drive the blade assembly 16 in rotation in the jar 24.
  • the base part 11 further comprises a microcontroller (not shown) for controlling the gearing system 70 and the heating assembly 12.
  • the heating assembly 12 is illustrated in more detail in Fig.8A to Fig.9B .
  • the heating assembly 12 includes the heating plate 22 and a heating element 71 extending within the heating plate 22.
  • the heating plate 22 has an external heating surface 72 facing upwards.
  • the heating plate 22 is generally circular and has a diameter that is less than the diameter of the grip element 21.
  • the diameter of the heating plate 22 corresponds substantially to the diameter of the bottom plate 15.
  • the heating plate 22 is preferably made of die-cast aluminium.
  • the heating plate 22 is provided with a central aperture 73.
  • the central aperture 73 is configured to receive the coupling element 20 when the jar assembly 13 is secured to the base part 11.
  • the central aperture 73 is preferably circular and has a diameter in the range [22 mm; 50 mm], for example a diameter of approximately 36 millimetres.
  • the heating plate 22 further comprises an additional aperture 74.
  • the additional aperture 74 is preferably round-shaped.
  • the additional aperture 74 is preferably smaller than the central aperture 73.
  • the additional aperture 74 has a diameter in the range [6 mm; 30 mm], for example a diameter of approximately 10 millimetres.
  • the additional aperture 74 extends through the heating plate 22 between the central aperture 73 and the circumference of the heating plate 22.
  • the additional aperture 74 is located in the heating plate 22 substantially halfway between the centre of the heating plate 22 and a point situated in the circumference of the heating plate 22.
  • the heating element 71 is preferably cast into the heating plate 22.
  • the heating element 71 is for example in the form of a copper tube receiving a thin coil-shaped copper wire (not shown) and filled with magnesium oxide surrounding the copper wire. In operation, an electrical current runs through the copper wire. Due to the resistance of the copper wire, heat is generated and transferred outwards to the heating plate 22 surrounding the copper tube.
  • the heating element 71 is arch-shaped and extends concentrically with the circular heating plate 22.
  • the heating element 71 comprises a first electrical connection C1 in the form of a first end point or first cold pin, and a second electrical connection C2 in the form of a second end point or second cold pin.
  • the first and second electrical connections C1, C2 extend substantially vertically downwards below the heating plate 22.
  • the additional aperture 74 is located in the heating plate 22 between the first and second electrical connections C1, C2.
  • the temperature sensor 23 or heat sensor is preferably in the form of a thermistor 23.
  • the thermistor 23 is provided in the base part 11.
  • the thermistor 23 extends through the additional aperture 74.
  • the thermistor 23 is therefore arranged in-between the first electrical connection and the second electrical connection C1, C2.
  • the thermistor 23 extends vertically in the base part 11.
  • the thermistor 23 is movable in the additional aperture 74.
  • the thermistor 23 is slideable vertically through the additional aperture 74.
  • the thermistor 23 is movable along a vertical direction D relative to the heating plate 22.
  • the thermistor 23 advantageously exhibits a negative temperature coefficient (NTC) behaviour.
  • NTC negative temperature coefficient
  • a cap 75 is provided at an upper end 78 of the thermistor 23.
  • the cap 75 encapsulates the upper end 78 of the thermistor 23.
  • the cap 75 is fixed to the thermistor 23.
  • the cap 75 comprises a flat top part 76.
  • the upper end 78 of the thermistor 23 is in contact with the flat top part 76.
  • the cap 75 is cylindrical-shaped.
  • the cap 75 has a diameter in the range [5 mm; 20 mm].
  • the cap 75 is preferably made of a high temperature resistant material. The cap 75 therefore withstands high temperatures and does not deteriorate when the heating assembly 12 operates.
  • the cap 75 is preferably made of a high thermal conductive material to ensure that heat from the heated bottom plate 15 is effectively transferred to the thermistor 23.
  • the cap 75 is preferably made of a low electrically conductive material.
  • the cap 75 is made of a ceramic material.
  • the heating plate 22 and the cap 75 are dimensioned so that an air-gap 79 is created between the heating plate 22 and the cap 75.
  • a guiding member 80 is preferably arranged within the additional aperture 74 to maintain the capped thermistor 23 spaced apart from the heating plate 22.
  • the guiding member 80 is advantageously fixed to the heating plate 22 and receives the capped thermistor 23 in the additional aperture 74.
  • the air-gap 79 is in the form of a generally annular hollow volume extending between the heating plate 22 and the capped thermistor 23.
  • the air-gap 79 has a width of at least 1 millimetre.
  • the air-gap 79 ensures that heat conduction from the heating element 71 directly to the thermistor 23 is limited. As such, the air-gap 79 acts as a thermal insulator between the heating element 71 and the thermistor 23. Therefore, the air-gap 79 ensures that the heat coming from the bottom plate 15 towards the thermistor 23 is predominant over the heat coming from the heating element 71, and that the thermistor 23 is therefore responsive to the heat coming from the bottom plate 15 rather than to the heat coming from the heating element 71. This allows the thermistor 23 to properly detect the temperature in the jar 24 without being disrupted by the heat coming from the heating element 71.
  • an insulating member 81 is provided in the air-gap 79 for further limiting heat conduction from the heating element 71 directly to the thermistor 23.
  • the insulating member 81 is for example in the form of an insulating sleeve 81 arranged along the circumference of the additional aperture 74.
  • the insulating sleeve 81 is spaced apart from the capped thermistor 23.
  • the insulating sleeve 81 surrounds the capped thermistor 23.
  • the capped thermistor 23 is adapted to move between a first position P1 and a second position P2.
  • the top part 76 is proud of the external heating surface 72.
  • the given distance is advantageously in the range [1 mm; 10 mm], for example 2 millimetres.
  • the cap 75 is adapted to take the first position P1 when the bottom part 14 does not contact the heating plate 22.
  • the top part 76 is aligned or flush with the external heating surface 72.
  • the cap 75 is adapted to move towards the second position P2 when the bottom part 14 contacts with the heating plate 22.
  • a spring mechanism 77 may be provided in the base part 11 to provide the thermistor 23 with a vertical retention force so that the thermistor 23 is biased upwards, towards the first position P1.
  • the capped thermistor 23 is positioned in the heating assembly 12 so that when the jar assembly 13 is placed on the base part 11, the bottom plate 15 touches and depresses the capped thermistor 23, urging the capped thermistor 23 from the first position P1 towards the second position P2.
  • the guiding member 80 guides the cap 75 vertically when the cap 75 moves through the additional aperture 74 between the first position P1 and the second position P2.
  • a stop member 82 is provided at a lower end 83 of the cap 75 to prevent the cap 75 from moving beyond the given distance.
  • the encapsulated thermistor 23 touches the bottom plate 15 whilst the jar assembly 13 is in place on the base part 11 so that the thermistor 23 can measure the temperature of the bottom plate 15 and therefore provide the user with a temperature feedback of the food ingredients in the jar 24.
  • the position of the thermistor 23 in the heating assembly 12 is such that an accurate sensing of the temperature of the bottom part 14 is enabled.
  • the blender 10 therefore allows for an effective cooking of the ingredients and helps preventing from undercooking, overcooking, overflowing or dry-boiling.
  • the blender 10 has been described as being a cooking blender, the present invention can be applied to any other kitchen appliance having a heating plate 22 and a central drive system, such as a food processor or a mixer grinder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Food-Manufacturing Devices (AREA)
  • Cookers (AREA)

Claims (15)

  1. Mixer (10) zum Mischen von Zutaten, wobei der Mixer (10) Folgendes umfasst:
    - ein Basisteil (11), das eine Heizplatte (22) umfasst,
    - einen Behälter (13) zum Aufnehmen der Zutaten, wobei der Behälter (13) von dem Basisteil (11) abnehmbar ist und ein unteres Teil (14) zum Kontakt mit der Heizplatte (22) umfasst,
    wobei das Basisteil (11) einen Temperatursensor (23) zum Messen der Temperatur des unteren Teils (14) umfasst,
    dadurch gekennzeichnet, dass sich der Temperatursensor (23) durch die Heizplatte (22) hindurch erstreckt.
  2. Mixer (10) nach Anspruch 1, wobei, wenn der Behälter (13) an dem Basisteil (11) angebracht ist und die Heizplatte (22) in Kontakt mit dem unteren Teil (14) steht, der Temperatursensor (23) in Kontakt mit dem unteren Teil (14) steht.
  3. Mixer (10) nach Anspruch 1 oder 2, wobei die Heizplatte (22) ein Heizelement (71) umfasst, wobei sich der Temperatursensor (23) durch die Heizplatte (22) hindurch in einem Bereich erstreckt, in dem sich das Heizelement (71) nicht erstreckt.
  4. Mixer (10) nach Anspruch 3, wobei das Heizelement (71) bogenförmig ist und einen ersten elektrischen Anschluss (C1) und einen zweiten elektrischen Anschluss (C2) umfasst, wobei der Temperatursensor (23) zwischen dem ersten elektrischen Anschluss (C1) und dem zweiten elektrischen Anschluss (C2) eingerichtet ist.
  5. Mixer (10) nach einem der vorhergehenden Ansprüche, wobei der Temperatursensor (23) einen Thermistor (23) umfasst.
  6. Mixer (10) nach Anspruch 5, wobei der Temperatursensor (23) eine Kappe (75) umfasst, die den Thermistor (23) einkapselt.
  7. Mixer (10) nach Anspruch 6, wobei die Kappe (75) aus einem hochtemperaturbeständigen Material besteht.
  8. Mixer (10) nach Anspruch 6 oder 7, wobei die Kappe (75) zylinderförmig ist.
  9. Mixer (10) nach einem der Ansprüche 6 bis 8, wobei die Heizplatte (22) eine Öffnung (74) zum Aufnehmen der Kappe (75) umfasst.
  10. Mixer (10) nach einem der Ansprüche 6 bis 9, wobei die Heizplatte (22) und die Kappe (75) dimensioniert sind, um einen Luftspalt dazwischen zu erstellen.
  11. Mixer (10) nach einem der Ansprüche 6 bis 10, wobei die Kappe (75) entlang einer senkrechten Richtung (D) im Verhältnis zu der Heizplatte (22) bewegbar ist, wobei die Kappe (75) ein flaches oberes Teil (76) umfasst, wobei die Kappe (75) angepasst ist, um eine erste Position (P1) einzunehmen, wenn das untere Teil (14) nicht mit der Heizplatte (22) in Kontakt kommt, und eine zweite Position (P2) einzunehmen, wenn das untere Teil (14) mit der Heizplatte (22) in Kontakt kommt, wobei das flache obere Teil (76) um einen gegebenen Abstand aus einer externen Oberfläche (72) der Heizplatte (22) in der ersten Position (P1) herauskommt, wobei das flache obere Teil (76) auf die externe Oberfläche (72) in der zweiten Position (P2) ausgerichtet ist.
  12. Mixer (10) nach Anspruch 11, wobei der gegebene Abstand in dem Bereich [1 mm; 10 mm] liegt.
  13. Mixer (10) nach Anspruch 11 oder 12, wobei die Kappe (75) in Richtung auf die erste Position (P1) vorgespannt ist.
  14. Mixer (10) nach einem der Ansprüche 11 bis 13, wobei der Thermistor (23) mit dem flachen oberen Teil (76) in Kontakt steht.
  15. Mixer (10) nach einem der Ansprüche 5 bis 14, wobei der Thermistor (23) ein Thermistor mit negativem Temperaturkoeffizient ist.
EP16781723.8A 2015-10-12 2016-10-08 Mixer mit temperatursensor Active EP3220789B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15189394 2015-10-12
PCT/EP2016/074116 WO2017063962A1 (en) 2015-10-12 2016-10-08 A blender with temperature sensor

Publications (2)

Publication Number Publication Date
EP3220789A1 EP3220789A1 (de) 2017-09-27
EP3220789B1 true EP3220789B1 (de) 2018-06-06

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US (1) US10327594B2 (de)
EP (1) EP3220789B1 (de)
JP (1) JP6336205B2 (de)
CN (2) CN113491457A (de)
RU (1) RU2643413C1 (de)
WO (1) WO2017063962A1 (de)

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Publication number Publication date
CN113491457A (zh) 2021-10-12
US10327594B2 (en) 2019-06-25
WO2017063962A1 (en) 2017-04-20
EP3220789A1 (de) 2017-09-27
RU2643413C1 (ru) 2018-02-01
JP2017533743A (ja) 2017-11-16
US20180206677A1 (en) 2018-07-26
JP6336205B2 (ja) 2018-06-06
CN107072444A (zh) 2017-08-18

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